The Environmental Law Foundation says that certain baby foods contain lead levels high enough to require the labels under state law. The companies contend that the U.S. Food and Drug Administration (FDA) has ruled that the lead content in the products does not warrant a label, the Associated Press notes.

Baby products that feature pears, peaches, carrots, grape juice and sweet potatoes have trace amounts of lead. The companies claim the lead occurs naturally in the foods and that the levels fall below the standard that requires labeling.

Environmentalists argue that California’s Proposition 65 mandates labeling for product that whose lead content is 1/1000 of levels considered dangerous under federal standards.

The companies named in the lawsuit include Del Monte Foods, Beech-Nut and Nestle’s (PINK:NSRGY) Gerber, among others.